How can you get a computer - whether a desktop PC, web server, or smartphone - to automatically execute a desired sequence of tasks? This book explains to readers how to quickly create their first programs using object-oriented approaches, even without prior knowledge. All that is needed is a computer with an internet browser and a text editor. The focus of the book is on JavaScript, a programming language that is embedded in HTML documents and then executed in the browser. The author places special emphasis on the systematic presentation of object orientation in JavaScript. The underlying document description language HTML is explained only to the extent necessary for understanding the JavaScript topics covered. All examples discussed in the book can be downloaded.